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Starting/Charging System Diagnostic System Check

  1. Verify battery is fully charged. If battery is fully charged, go to next step. If battery is not fully charged, charge as necessary and recheck system operation.
  2. Connect scan tool to DLC located under steering column. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST A: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  3. Turn ignition on. Attempt to establish communication with Body Control (BCM) and Powertrain Control Modules (PCM). If scan tool communicates with BCM and PCM, go to next step. If scan tool does not communicate with BCM and PCM, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  4. Using scan tool, check for DTCs stored in BCM or PCM. If no DTCs are stored, repair charging system. See appropriate GENERATORS & REGULATORS article. If any DTCs are stored, go to next step.
  5. Check for communication DTCs. These DTCs will begin with "U". If no "U" DTCs exist, go to next step. If any "U" DTC exists, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  6. If scan tool displays DTCs P0562, P0563, P1637 or P1638, see GENERATORS & REGULATORS - CORVETTE article in STARTING & CHARGING SYSTEMS.
  7. If DTC B1000 is set, go to DTC B1000: ECU MALFUNCTION  under DIAGNOSTIC TESTS. If DTC B1000 is not set, go to next step.
  8. If scan tool displays DTCs B2721, B2722, B2723 or B2735, perform diagnostic tests in ANTI-THEFT SYSTEMS - CORVETTE article. If DTCs are not set, system is operating properly at this time.
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